CN111835012B - Voltage control method, device and system for preventing new energy cascading failure - Google Patents
Voltage control method, device and system for preventing new energy cascading failure Download PDFInfo
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- CN111835012B CN111835012B CN202010685909.0A CN202010685909A CN111835012B CN 111835012 B CN111835012 B CN 111835012B CN 202010685909 A CN202010685909 A CN 202010685909A CN 111835012 B CN111835012 B CN 111835012B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a voltage control method, a device and a system for preventing new energy cascading failures, which belong to the technical field of power system operation and control, wherein the voltage control method comprises the steps of determining a new energy off-grid forecast accident set, evaluating and calculating the influence of the forecast accident set on regional bus voltage, and calculating bus voltage limit deviation; and substituting the bus voltage limit value deviation into a secondary voltage correction model to obtain a secondary voltage control decision to carry out voltage coordination control in the region. The method solves the problem that the new energy is continuously off-line due to the large change of the off-line voltage of a single new energy station, can eliminate or reduce the out-of-limit degree of the power grid voltage after single fault, and improves the safety degree of the new energy grid-connected voltage.
Description
Technical Field
The invention relates to a voltage control method, a voltage control device and a voltage control system for preventing new energy cascading failures, and belongs to the technical field of operation and control of power systems.
Background
The secondary voltage control is a core function for realizing the reactive voltage decision of the new energy cluster grid-connected area, can realize the reactive voltage coordination strategy of various reactive power sources in the area, ensures the voltage constraint of each node, and has good convergence and universal applicability. However, in the prior art, the above algorithm does not consider the factor that the voltage drop after the new energy is disconnected causes the new energy to be collected at the grid-connected point or the voltage of the new energy on the grid-connected side is too low, and the factor is very easy to cause the occurrence of the chain disconnection accident of the new energy station, thereby bringing great threat and challenge to the safe operation of the power grid.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a voltage control method, a voltage control device and a voltage control system for preventing new energy cascading failures, which can eliminate or reduce the out-of-limit degree of the grid voltage after single failure, improve the safety degree of the new energy grid-connected voltage, and support the safe consumption of new energy.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the invention provides a voltage control method for preventing a new energy cascading failure, which includes the following steps:
determining a new energy off-line forecast accident set, evaluating the influence of the forecast accident set on the regional bus voltage and calculating the bus voltage limit deviation;
and performing secondary voltage control correction by combining the bus voltage limit value deviation to obtain a secondary voltage control decision to perform intra-area voltage coordination control.
Further, the method for determining the set of new energy forecast accidents comprises the following steps:
and carrying out area scanning according to the expected accident to determine an accident set which generates voltage influence on the safe operation of the new energy collection area.
Further, the method for evaluating and calculating the influence of the expected accident set on the regional bus voltage comprises the following steps:
calculating the bus voltage variation according to the predicted accidents of the multi-round single new energy station, evaluating the influence of the predicted accident set on the bus voltage lower limit deviation, and calculating the bus voltage lower limit deviation; wherein the content of the first and second substances,
the influence of the expected accident set on the regional bus voltage lower limit deviation is enabled to pass through delta Vi,jCharacterization, Δ Vi,jThe calculation is obtained by the following formula:
in the formula: viIs the current value of the voltage of the ith bus bar node; vi,jAnd the voltage after the fault of the ith bus node after the jth line fault is obtained, wherein i and j are positive integers.
Further, the method comprises the following steps: combining the influence of the expected accident set on the regional bus voltage lower limit deviation, adding a voltage deviation correction coefficient to the bus voltage lower limit deviation, and performing relaxation constraint to evaluate the bus voltage lower limit correction deviation influenced by the expected accident, wherein the formula is expressed as follows:
ΔVi dn＝λimin(ΔVi,1,ΔVi,2,…,ΔVi,m)
in the formula ofiThe voltage deviation correction coefficient of the ith calculation node is in a range of 0-1; Δ Vi,jThe influence of the ith bus voltage on the area after the jth expected accident is shown, and m is a positive integer.
Further, the model for performing the secondary voltage control correction is represented as:
in the formula Vp、
Respectively obtaining the current voltage and the optimized voltage target value of a central bus in the region;
the voltage-reactive sensitivity of the regional unit and the capacitive reactance device to the central bus is respectively; delta Qg、ΔQcRespectively the reactive power adjustment quantity of the unit and the capacitive reactance device; vi、
AndV irespectively obtaining the current value, the upper limit and the lower limit of the ith bus voltage in the region;
correcting deviation for estimating the lower limit of the bus voltage influenced by the expected accident;
the voltage-reactive sensitivity of the regional unit and the capacitive reactance device to the ith bus is respectively; qg、
AndQ grespectively setting the current reactive power, the upper reactive power limit and the lower reactive power limit of the unit in the region; qc、
AndQ crespectively the current reactive power, the upper reactive power limit and the lower reactive power limit of the reactor in the area.
Further, the method for obtaining the secondary voltage control decision comprises the following steps:
calculating the secondary voltage correction model, and determining a regional secondary voltage control decision if the model calculation is converged; and if the model is diverged in calculation, judging the voltage constraint causing the divergence, performing constraint relaxation by reducing a voltage deviation correction coefficient, performing iterative calculation until the calculation is converged, and determining a secondary voltage control decision of the region.
In a second aspect, the invention provides a voltage control device for preventing new energy cascading failure, which includes the following modules:
a deviation calculation module: determining a new energy off-line expected accident set, evaluating and calculating the influence of the expected accident set on the regional bus voltage, and calculating the bus voltage limit deviation;
a control decision module: and performing secondary voltage control correction by combining the bus voltage limit value deviation to obtain a secondary voltage control decision to perform intra-area voltage coordination control.
In a third aspect, the invention provides a voltage control device for preventing new energy cascading failure, which comprises a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method of any of the second aspects.
In a fourth aspect, the invention provides a new energy plant station voltage control system, which includes the voltage control device for preventing the new energy cascading failure according to the second aspect or the third aspect.
Compared with the prior art, the invention has the following beneficial effects:
on the basis of traditional secondary voltage control, the influence of an expected offline accident of a new energy plant station on the regional bus voltage is comprehensively considered, voltage limit deviation is introduced to carry out secondary voltage control correction and obtain a control decision, multiple reactive power sources in a region are coordinately controlled, the capability of a power grid for resisting the offline fault disturbance of the new energy is improved, the out-of-limit degree of the power grid voltage after single fault is eliminated or reduced, the safety degree of the new energy grid-connected voltage is improved, and the safe consumption of the new energy is supported;
by adding the voltage deviation correction coefficient to the bus voltage lower limit deviation for constraint relaxation and iterative calculation, the calculation efficiency and the calculation convergence are improved, the risk of new energy interlocking off-line can be effectively reduced, and the new energy safe consumption and voltage safe operation level are improved.
Drawings
Fig. 1 is a schematic flowchart of a voltage control method for preventing a new energy cascading failure according to an embodiment of the present invention;
FIG. 2 is a detailed flow diagram of the voltage control method of FIG. 1;
fig. 3 is a system block diagram of a voltage control device for preventing a new energy cascading failure according to a second embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The first embodiment is as follows:
as shown in fig. 1 and 2, a voltage control method for preventing a new energy cascading failure according to an embodiment of the present invention includes the following steps:
the method comprises the following steps: and determining a new energy off-line forecast accident set, evaluating the influence of the forecast accident set on the regional bus voltage and calculating the bus voltage limit deviation.
Specifically, the method comprises the steps of performing area scanning on N-1 expected accidents based on a new energy station, and determining an accident set which has a large voltage influence on the safe operation of a new energy gathering area; calculating the influence of each fault in the accident set on the regional bus voltage can be understood as follows: calculating the bus voltage variation according to the expected accidents of the multi-round single new energy station, and evaluating the influence of an expected accident set on the lower limit deviation of the bus voltage; and calculating the deviation of the bus voltage limit value by synthesizing all accidents in the accident set, and only considering the deviation of the bus voltage limit value because node voltage drops are mainly caused by new energy source grid disconnection.
Wherein the expected accident set influences the regional bus voltage lower limit deviation through delta Vi,jCharacterization, Δ Vi,jThe calculation is obtained by the following formula:
in the formula: viIs the current value of the voltage of the ith bus bar node; vi,jThe voltage after the fault of the ith bus node after the jth line fault is obtained, wherein i and j are positive integers; since low voltage is an important factor causing a new energy cascading failure, only the set of expected accidents causing the voltage drop is considered.
Step two, because node voltage drops are mainly caused by new energy off-line, only the bus voltage lower limit deviation is considered, the convergence of the algorithm and the importance degree of the bus node are considered, a voltage deviation correction coefficient is added to the bus voltage lower limit deviation, different buses are properly defined to be relaxed, the convergence of the algorithm is improved, and the following formula (1) is adopted for expression:
ΔVi dn＝λimin(ΔVi,1,ΔVi,2,…,ΔVi,m) Formula (2)
In the formula ofiThe voltage deviation correction coefficient of the ith calculation node is in a range of 0-1; Δ Vi,jThe influence on the ith bus voltage of the area after the jth expected accident is shown, wherein m is a positive integer; since the expected accident of new energy off-line generally causes voltage drop, the voltage lower limit deviation delta V of the bus can be knowni dn＜0。
And substituting the bus voltage limit value deviation corrected by the voltage deviation correction coefficient into a secondary voltage control correction model to obtain a secondary voltage control decision, and performing intra-area voltage coordination control.
Wherein, the secondary voltage control correction model is expressed by an expression (2):
in the formula Vp、
Respectively obtaining the current voltage and the optimized voltage target value of a central bus in the region;
the voltage-reactive sensitivity of the regional unit and the capacitive reactance device to the central bus is respectively; delta Qg、ΔQcRespectively the reactive power adjustment quantity of the unit and the capacitive reactance device; vi、
AndV irespectively obtaining the current value, the upper limit and the lower limit of the ith bus voltage in the region;
correcting deviation for estimating the lower limit of the bus voltage influenced by the expected accident;
the voltage-reactive sensitivity of the regional unit and the capacitive reactance device to the ith bus is respectively; qg、
AndQ grespectively setting the current reactive power, the upper reactive power limit and the lower reactive power limit of the unit in the region; qc、
AndQ crespectively the current reactive power, the upper reactive power limit and the lower reactive power limit of the reactor in the area.
According to the formula (3), the condition that the voltage of the important bus node in the area after the fault is higher can be ensured by adjusting the lower limit constraint of the bus voltage after the expected accident occurs, the voltage support is provided for new energy grid connection, and the risk that the protection action is disconnected from the grid when the voltage of the new energy station exceeds the lower limit is reduced. If the regional calculation is converged, performing regional decision; if the calculation is divergent, judging the voltage constraint causing the divergence, performing constraint relaxation by reducing a voltage deviation correction coefficient lambda, performing correction secondary control decision calculation, and continuing the voltage deviation correction coefficient adjustment until the regional secondary voltage control decision calculation is convergent, namely ensuring the convergence of equation solution by iterative calculation.
Compared with the traditional method, the method fully considers the influence of the predicted accident of the new energy on the bus voltage of the area, carries out comprehensive evaluation and calculation on the bus voltage influence, corrects a secondary voltage control decision, coordinates various reactive power sources in the area to carry out coordination control, improves the capability of a power grid for resisting large disturbance of the new energy off-grid fault, and is suitable for an actual engineering field; and a voltage deviation correction coefficient lambda is introduced for constraint relaxation, so that the calculation efficiency and the calculation convergence are improved, the risk of chain off-line of the new energy can be effectively reduced, and the safe consumption of the new energy and the safe operation level of voltage are improved.
Example two:
as shown in fig. 3, an embodiment of the present invention provides a voltage control apparatus for preventing a new energy cascading failure, including the following modules:
a deviation calculation module: determining a new energy off-line forecast accident set, evaluating the influence of the forecast accident set on the regional bus voltage and calculating the bus voltage limit deviation;
a control decision module: and performing secondary voltage control correction by combining the bus voltage limit value deviation to obtain a secondary voltage control decision to perform intra-area voltage coordination control.
Specifically, the control decision module can be used for judging and deciding whether each reactive power source in the region can avoid or reduce the voltage out-of-limit degree of the predicted accident of new energy grid disconnection through adjustment, and if the region calculation is converged, determining a region control decision; if the region calculation diverges, judging the voltage constraint causing divergence, performing constraint relaxation by reducing a voltage deviation correction coefficient lambda, performing correction secondary control decision calculation, and continuing the voltage deviation correction coefficient adjustment until the region secondary voltage control decision calculation converges.
Example three:
the embodiment of the invention provides a voltage control device for preventing new energy cascading failure, which comprises a processor and a storage medium, wherein the processor is used for processing a new energy cascading failure;
the storage medium is used for storing instructions;
the processor is configured to operate according to the instructions to perform the steps of the voltage control method of embodiment two.
Example four:
the embodiment of the invention provides a new energy station voltage control system which comprises a new energy cascading failure prevention voltage control device in the second embodiment or the third embodiment.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A voltage control method for preventing cascading failure of new energy is characterized by comprising the following steps:
determining a new energy off-line forecast accident set, evaluating the influence of the forecast accident set on the regional bus voltage and calculating the bus voltage limit deviation;
performing secondary voltage control correction by combining the bus voltage limit value deviation to obtain a secondary voltage control decision to perform voltage coordination control in the region;
the method for evaluating and calculating the influence of the expected accident set on the regional bus voltage comprises the following steps:
calculating the bus voltage variation according to the expected accidents of the multi-round single new energy station, and evaluating the influence of an expected accident set on the lower limit deviation of the bus voltage; wherein the content of the first and second substances,
the influence of the expected accident set on the regional bus voltage lower limit deviation is enabled to pass through delta Vi,jCharacterization, Δ Vi,jThe calculation is obtained by the following formula:
in the formula: viIs the current value of the voltage of the ith bus bar node; vi,jAnd the voltage after the fault of the ith bus node after the jth line fault is obtained, wherein i and j are positive integers.
2. The voltage control method for preventing the cascading failure of the new energy source according to claim 1, wherein the method for determining the expected accident set of the new energy source comprises the following steps:
and performing area scanning according to the expected accident, and determining an accident set which generates voltage influence on the safe operation of the new energy collection area.
3. The voltage control method for preventing the cascading failure of the new energy source according to claim 1, further comprising the following steps of:
combining the influence of the expected accident set on the regional bus voltage lower limit deviation, adding a voltage deviation correction coefficient to the bus voltage lower limit deviation, and performing relaxation constraint to evaluate the bus voltage lower limit correction deviation influenced by the expected accident, wherein the formula is expressed as follows:
ΔVi dn＝λimin(ΔVi,1,ΔVi,2,…,ΔVi,m)
in the formula ofiThe voltage deviation correction coefficient of the ith calculation node is in a range of 0-1; Δ Vi,jThe influence of the ith bus voltage on the area after the jth expected accident is shown, and m is a positive integer.
4. The voltage control method for preventing the new energy cascading failure according to claim 1, wherein the model for performing the secondary voltage control correction is represented as:
in the formula Vp、
Respectively obtaining the current voltage and the optimized voltage target value of a central bus in the region;
the voltage-reactive sensitivity of the regional unit and the capacitive reactance device to the central bus is respectively; delta Qg、ΔQcRespectively the reactive power adjustment quantity of the unit and the capacitive reactance device; vi、
And ViRespectively obtaining the current value, the upper limit and the lower limit of the ith bus voltage in the region; Δ Vi dnCorrecting deviation for estimating the lower limit of the bus voltage influenced by the expected accident;
the voltage-reactive sensitivity of the regional unit and the capacitive reactance device to the ith bus is respectively; qg、
AndQ grespectively setting the current reactive power, the upper reactive power limit and the lower reactive power limit of the unit in the region; qc、
AndQ crespectively the current reactive power, the upper reactive power limit and the lower reactive power limit of the reactor in the area.
5. The voltage control method for preventing the cascading failure of the new energy resource according to claim 4, wherein the method for obtaining the secondary voltage control decision comprises the following steps:
calculating the secondary voltage control corrected model, and determining a regional secondary voltage control decision if the model calculation is converged; and if the model is diverged in calculation, judging the voltage constraint causing the divergence, performing constraint relaxation by reducing a voltage deviation correction coefficient, performing iterative calculation until the calculation is converged, and determining a secondary voltage control decision of the region.
6. The utility model provides a prevention new forms of energy cascading failure voltage control device which characterized in that includes following module:
a deviation calculation module: determining a new energy off-line expected accident set, evaluating and calculating the influence of the expected accident set on the regional bus voltage, and calculating the bus voltage limit deviation;
a control decision module: substituting the bus voltage limit value deviation into a secondary voltage control correction model to obtain a secondary voltage control decision to carry out voltage coordination control in the region;
the method for evaluating and calculating the influence of the expected accident set on the regional bus voltage by the deviation calculation module comprises the following steps of:
calculating the bus voltage variation according to the expected accidents of the multi-round single new energy station, and evaluating the influence of an expected accident set on the lower limit deviation of the bus voltage; wherein the content of the first and second substances,
the influence of the expected accident set on the regional bus voltage lower limit deviation is enabled to pass through delta Vi,jCharacterization, Δ Vi,jThe calculation is obtained by the following formula:
in the formula: viIs the current value of the voltage of the ith bus bar node; vi,jIs the ith bus node after the jth line faultAnd (4) the after-barrier voltage, wherein i and j are positive integers.
7. The voltage control device for preventing the new energy cascading failure is characterized by comprising a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of claims 1 to 5.
8. A new energy plant station voltage control system, characterized by comprising the new energy cascading failure prevention voltage control device of claim 6 or 7.
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